Crossword Genius

Gets all one can from fish drink (9)

Ross

I believe the answer is:

milkshake

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'drink' is the definition.
(I know that milkshake is a type of drink)

I can't explain the rest of the clue.

Can you help me to learn more?

(Another definition for milkshake that I've seen is " Cold whisked drink".)

I've seen this clue in The Times.
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